Can't use name="length" on a select element

[Jason Βoxman]

For example, this doesn't work:

        <select name="length">
          <option value="8">8</option>
          <option value="9">9</option>
          <option value="10">10</option>
          <option value="11">11</option>
          <option value="12" selected>12</option>
          <option value="13">13</option>
          <option value="14">14</option>
          <option value="15">15</option>
          <option value="16">16</option>
        </select>

But if I change it to name="abc" it does.